Writing instrument



FIG. 1 is a perspective view of the writing instrument showing the new design;

FIG. 2 is a front elevation view of the writing instrument of FIG. 1;

FIG. 3 is a right side elevation view of the writing instrument as shown in FIG. 2, the left side elevation view being the mirror image of the view in FIG. 3;

FIG. 4 is a bottom view of the writing instrument shown in FIG. 2;

FIG. 5 is a top plan view of the writing instrument shown in FIG. 2, the indicia depicted by means of broken lines being for illustrative purposes only and forming no part of the claimed design; and,

FIG. 6 is a rear elevation view of the writing instrument of FIG. 2. 

The ornamental design for a writing instrument, as shown and described. 